I was surprised by a video of Murray Hallam were He shows a aloe vera growing in a gravel bed I tried on my raft system and wasted a few plants I guest the way to go on aloe vera is by flood & drain.
A tip for the lady's if you have those little red veins in your ankle ares, rub the gel of aloe vera and in a few days they will be goon. Aloe vera penetrate the skin 5 times deeper than water, Ask my wife.
Well, I got lots of aloe, it seems to grow well for me. Where I am I find it best to give them at least partial shade when growing outdoors and they seem to do very well in gravel beds and I've even had some do well in a constant flood gravel bed though flood and drain is probably best for them.
Another medicinal herb (as well as being edible) is plantain (the lawn weed) I find it really handy to have some leaves washed and frozen in a ziplock in the freezer. Whenever I get a bad sting I use the nice cold frozen leaves as a poultice on the sting. that stuff is good for healing and the husks around the seeds are used to make one of the fiber supplements on the market. They grow well in aquaponics too and they would probably do well in the raft bed, I've grown some in my NFT pipes.